The CiteThisPage extension, previously known as SpecialCite.php, is an extension that creates a special page (Special:CiteThisPage) and toolbox link to it for pages in the main namespace.
Given an article name, this extension generates citations to it in a variety of styles.

Installation

Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

To users running MediaWiki 1.24 or earlier:

The instructions above describe the new way of installing this extension using wfLoadExtension() If you need to install this extension on these earlier versions (MediaWiki 1.24 and earlier), instead of wfLoadExtension('CiteThisPage');, you need to use:

Variables

The parser variables e.g. {{CURRENTTIME}}, {{CURRENTMONTH}} etc. will display the time of the last edit to the requested page, to get the current time use <citation>, e.g. <citation>{{CURRENTTIME}}</citation>.

This extension is being used on one or more Wikimedia projects. This probably means that the extension is stable and works well enough to be used by such high-traffic websites. Look for this extension's name in Wikimedia's CommonSettings.php and InitialiseSettings.php configuration files to see where it's installed. A full list of the extensions installed on a particular wiki can be seen on the wiki's Special:Version page.